Error correction/masking for digital voice transmission over the land mobile satellite system

TitleError correction/masking for digital voice transmission over the land mobile satellite system
Publication TypeJournal Article
Year of Publication1989
AuthorsBryden, B., G. E. Seguin, J. Conan, V. K. Bhargava, and A. Brind'amour
JournalCommunications, IEEE Transactions on
Pagination309 -314
Date Publishedmar.
Keywords2.4 kbit/s, 800 MHz, channel error concealment, channel error correction, digital voice transmission, error correction, error correction codes, error statistics, error-handling technique, fire code, land mobile satellite system, linear prediction vocoder, minimum shift keying, moving vehicle, MSK downlink, perceptual criteria, satellite relay systems, simulated channels, speech analysis and processing, speech digitiser, speech quality degradation, telecommunication channels, UHF, vocoders

The development of a 2400-b/s speech digitizer which provides an acceptable level of intelligibility and quality over land mobile satellite channels is described. Performance tests over simulated channels in the UHF band (800 MHz) are presented. The voice digitizer is a linear prediction (LPC) vocoder which uses a channel error correction and concealment procedure tailored to error statistics for a minimum-shift keyed (MSK) downlink to a moving vehicle. The error-handling technique is based on perceptual criteria and utilizes the parametric nature of LPC representation of speech. A single-error-correcting, single-burst-detecting (28, 20) fire code is shown to be the best choice for the application. The intelligibility of the vocoder is measured and compared to the standard LPC-10 algorithm. The major remaining sources of speech quality degradation due to channel errors are determined and ranked


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